Table 22 Behaviour of a pump when the power is re-instated after an electrical supply failure
Power is reinstated before
pump rotational speed falls
below 50%
Either parallel or
serial control mode
Regenerative power maintains all output signals
during the power failure. The pump will ramp to
its designated speed as quickly as possible after
the power has been restored.
Power is reinstated after
pump rotational speed falls
below 50% but before re-
generative power ceases
Either parallel or
serial control mode,
timer disabled
Regenerative power maintains all output signals
during the power failure. As the timer is
disabled, the motor controller will go into fail
condition as soon as speed falls below 50% and
will display flashing error code 0. When the
power is reinstated, the pump will not ramp up
until the error is cleared. To clear the error, send
a stop command (either parallel or serial,
depending on the control mode), then send a
start command to ramp the pump up to the
designated speed.
Either parallel or
serial control mode,
timer enabled
Regenerative power maintains all output signals
during the power failure. If power is reinstated
before the timer period expires, the pump will
ramp up to its designated speed as quickly as
possible. If the timer period expires, the motor
controller will go into fail condition and will
display flashing error code 3. As above, when the
power is reinstated, the pump will not ramp up
until the error is cleared. To clear the error, send
a stop command (either parallel or serial,
depending on the control mode), then send a
start command to ramp the pump up to the
designated speed.
Power is reinstated after
pump rotational speed falls
below 50% and the regen-
erative power ceases
Either parallel or
serial control mode
Regenerative power ceases and fails to maintain
output signals. When power is reinstated, the
pump with parallel control will automatically
restart if the start control on the logic interface
is set to start. The pump with serial control will
require a new start command to ramp the pump
up to the designated speed. Any fail signals that
were triggered during the regenerative power
period are lost when the power is reinstated.
7.9 Bakeout
If the pump (and the vacuum system) are heated, the degassing process will speed up
and the pump will reach ultimate vacuum in the shortest possible time. The pump may
only be heated on the flange with the flange heaters provided for this purpose from the
accessories. Heating the pump will also prevent condensation of vapours inside the
pump.
To Next Page
Loading...
